JP2004526911A5 - - Google Patents

Claims (27)

A pipe joint for the end of the pipe,
A female threaded coupling member and a male threaded coupling member threaded together to assemble a fitting on the end of the tube,
The female threaded coupling member has a tube grip device attached thereto;
The pipe gripping device is a pipe joint that separates into a tightened state from the female threaded member during assembly of the joint.   The pipe joint according to claim 1, wherein the pipe grip device functions as a single ferrule after being separated from the internally threaded member.   The pipe fitting of claim 1 wherein the male threaded member comprises an oblique cam surface that mates with the front end of the pipe gripping device while tightening the device to separate it from the female threaded member. .   4. A pipe joint according to claim 3, wherein said pipe gripping device is attached to said female threaded member by a thin web.   The pipe joint of claim 4 wherein said thin web is annular.   The pipe joint of claim 1, wherein the female thread coupling member and pipe gripping device are hardened to a hardness of at least about 3.3 times the material of the end of the pipe.   The pipe joint of claim 1, wherein the pipe gripping device is machined integrally with the female threaded member.   The male threaded member has an oblique cam surface that contacts the front end of the tube grip member during tightening, the cam surface having an interior angle of about 35 ° to about 60 ° with respect to the longitudinal axis of the joint. The pipe joint of Claim 1 which forms.   The female thread component and the male thread component are metal, and the tube gripping device generally has a narrow metal-to-metal line contact with the cam surface during full tightening of a joint. 8 pipe fittings.   The tube fitting of claim 1 wherein said tube gripping device separates along said surface from said internally threaded member, which prevents interference with said internally threaded member during further tightening of the joint.   The pipe fitting of claim 1, wherein the separated pipe grip member functions as a single ferrule during final tightening of the joint, the ferrule having a front end that digs into the outer surface of the end of the pipe.   The separated ferrule so that the central portion of the ferrule is radially compressed against the end of the tube to grip the end of the tube at a position axially away from the biting of the front end tube. 12. The pipe joint of claim 11, wherein the pipe joint is hinged radially inward during final tightening.   13. The pipe joint of claim 12, wherein the pipe gripping device comprises a cylindrical inner hole and a peripheral radial recess formed therein at a position spaced axially from the front end. A pipe joint for a pipe end,
A female threaded coupling member and a male threaded coupling member threaded together to assemble a fitting on the end of the tube;
The female threaded coupling member has a tube grip device attached thereto;
The male threaded coupling member has a tube end receiving hole and a cam surface facing the tube grip device during assembly at the end of the hole;
The pipe gripping device is a pipe joint that mates with the cam surface and separates from the internally threaded member during tightening.   15. The tube of claim 14, wherein the cam surface has a cam angle of about 35 ° to about 60 ° with respect to a longitudinal axis of the joint, and the tube gripping device forms a first seal with the cam surface. Fittings.   The tube fitting of claim 15, wherein at least a portion of the tube gripping device is at least about 3.3 times harder than the material of the tube end.   The pipe fitting of claim 16 wherein the end of the pipe is made of stainless steel.   16. The pipe joint of claim 15, wherein the pipe grip device functions as a single ferrule upon separation from the female threaded member.   The fitting of claim 15 wherein said cam surface is about 45 °.   The tube fitting of claim 15, wherein the tube grip device forms a first seal of generally metal-to-metal line contact with the cam surface.   15. The pipe joint of claim 14, wherein the pipe gripping device is attached to the female threaded member by a thin web.   The pipe fitting of claim 21, wherein the thin web comprises a stress concentrated notch. Type of pipe having a female coupling member and a male coupling member coupled to be assembled to a joint A female coupling member for a joint,
Female body with tube grip device, separated from it during tightening of joint
A female coupling member characterized by comprising: 24. The female coupling member of claim 23, wherein the female body comprises a metal. 25. The female coupling member of claim 24, wherein the female body comprises stainless steel. The tube gripping device includes a surface that engages the cam surface of the female coupling member during tightening of the joint. 24. The female coupling member according to claim 23. The cam surface forms an angle between 35 ° and 60 ° with respect to the longitudinal axis of the fitting. 3 female coupling members.